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Old Nov 21, 2006, 4:41 pm
  #12  
preiffer
 
Join Date: Apr 2003
Location: UK
Programs: Lots of shiny metallic ones.
Posts: 1,049
While strictly not possible, it HAS been reported on a few occasions that passengers have been able to "buy up" from a K to an S (with cash) and then use miles to upgrade the ticket IN ADVANCE.

There are examples detailed on v-flyer.com of this.
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